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  <title>Decodes a hexadecimally encoded binary string</title>
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  <div id="layout-content"><div id="function.sodium-hex2bin" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">sodium_hex2bin</h1>
  <p class="verinfo">(PHP 7 &gt;= 7.2.0)</p><p class="refpurpose"><span class="refname">sodium_hex2bin</span> &mdash; <span class="dc-title">Decodes a hexadecimally encoded binary string</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.sodium-hex2bin-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>sodium_hex2bin</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$hex</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$ignore</code></span>
  ] ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   Decodes a hexadecimally encoded binary string.
  </p>
  <p class="para">
   Like <span class="function"><a href="sodium_bin2hex.html" class="function">sodium_bin2hex()</a></span>, <span class="function"><strong>sodium_hex2bin()</strong></span>
   is resistant to side-channel attacks while <span class="function"><a href="hex2bin.html" class="function">hex2bin()</a></span> is not.
  </p> 

 </div>


 <div class="refsect1 parameters" id="refsect1-function.sodium-hex2bin-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>
<code class="parameter">hex</code></dt>

    <dd>

     <p class="para">
      Hexadecimal representation of data.
     </p>
    </dd>

   
   
    <dt>
<code class="parameter">ignore</code></dt>

    <dd>

     <p class="para">
      Optional string argument for characters to ignore.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.sodium-hex2bin-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the binary representation of the given <code class="parameter">hex</code> data.
  </p>
 </div>


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